Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)

E34 (1989 - 1995)

Reply
 
Thread Tools Display Modes
  #1  
Old 11-26-2012, 03:12 PM
AAframe AAframe is offline
Registered User
Location: CA
 
Join Date: Nov 2012
Posts: 16
Mein Auto: 530i touring
Quick question about fuel pressure regulator vacuum hose

Hi Everyone

I'm new to the forum, and realitively new to BMW's.

Thanks already for all of your contributions! It has helped greatly in diagnosing and fixing a few issues I'm sifting through.

Here's a quick question for the experts.

Is there supposed to be fuel in the vacuum hose that runs from the fuel pressure regulator to the rear intake plate...(or pvc plate)? Mine does...This is raising a red flag with me. Your knowledge is appreciated!

The vehicle is a 94 530i touring, stock with an m60 motor. It's been fun to work on...so far.

Thanks again
AA
Reply With Quote
Ads by Google
  #2  
Old 11-26-2012, 03:26 PM
AAframe AAframe is offline
Registered User
Location: CA
 
Join Date: Nov 2012
Posts: 16
Mein Auto: 530i touring
Here's a video of air bubbles making their way into the rear manifold plate. This is after the engine was turned off.



I've been having trouble with hard starts when the engine is warm, but sitting for 10+ minutes. I suspect this is the culprit, flooding the intake manifold.
Reply With Quote
  #3  
Old 11-26-2012, 03:55 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
No fuel in a vacuum hose. You have a ruptured diaphragm or similar in your system somewhere. This will definitely give you the poor warm start problem.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
  #4  
Old 11-26-2012, 08:21 PM
AAframe AAframe is offline
Registered User
Location: CA
 
Join Date: Nov 2012
Posts: 16
Mein Auto: 530i touring
Thanks for confirming BMW FF!

I disconnected the vacuum hose and plugged the ends. Ran the engine up to op temp and shut it down for 15 min. Started right up! First time thats happened in a loooong time!

Never would have found that prob had I not installed that clear hose.

Looks like I have the task of replacing the FPR....right after coffee in the morning!

Clear hoses rule!
AA
Reply With Quote
  #5  
Old 11-26-2012, 10:41 PM
paperplane94 paperplane94 is offline
Officially Welcomed to the 'Fest
Location: Los Angeles, CA
 
Join Date: Jan 2012
Posts: 927
Mein Auto: 1989 525i M20B25
^except they melt easily.
Reply With Quote
  #6  
Old 01-26-2013, 07:40 PM
jfe47 jfe47 is offline
Registered User
Location: Australia
 
Join Date: Jan 2013
Posts: 4
Mein Auto: E39 528i sedan
Hi, my problem appears to be very similar, where does the vacuum pipe from the FPR terminate? when the engine is off i can blow down the pipe easily with no apparent pressure build, resistance (back pressure) is this expected to be normal?
Reply With Quote
  #7  
Old 01-27-2013, 01:27 AM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
Yes - normal. It opens into the inlet manifold so that the diaphragm cam be exposed to manifold drpression.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
Reply

Bookmarks

Tags
fuel regulator, osv, pvc, vacuum hose question


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 08:50 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms